Positive stop for lifting jacks



Patented July 15, 1924.

AUNITED STATI-:s

CHARLES WILLIAM EIrsCH AND JAMES C. DAWLEY, OF DAYTON, OHIO, AssIGNOEs To THE JoYoE-CRIDLAND COMPANY, OE DAYTON, OHIO, A CORPORATION or OHIO'.

POSITIVE STOP FOR LIFTING- JACKS.

Application filed July V12,

To all whom t may concern:

Be it known that we, CHARLES W. Raison and JAMES C. DAWLEY, citizens kof the United States, residing at Dayton, in the county of Montgomery and State of Ohio,` have invented certain new and useful Im- 'provements in`Positive Stops Vfor `'Lifting Jacks, of which the follo-wing is a specification, referencebeing had therein to the accompanying drawing. t A

This invention relates to lifting jacks or 1`the" like. v

One Object of the invention is to provide means for limiting the movement of the lifting member of a jack or the like relatively tothe standard so as tol prevent the lifting member fromrv being run out of the standard and toprevent the standard from running off the lifting member and out of the housing when the jack as a whole is lifted from the-ground.

3 f'urtherjobject of the invention is to providev means for securing the nut to the standard. f y

A further object of the inventionV is to provide Vmeans for detachably securing the vnut tothe standard and for automatically disconnecting the same when the lifting element has been elevatedto a predetermined height. t

Other obj ects of the invention will appear as the device is described in detail.

In the accompanying drawings Fig. 1 is a sectional view,l partly in elevation, of a jack embodying ourinvention; Fig. 2 is a plan view-ofthel nut and the standard; Fig. 3 is ya vertical sectional 'view of the upper end of the standard, taken on the line 3 3 of Fig. 1; Fig. l is a vertical section of a modified form of the upper end of the Vstandard and nut showing the lifting element near theupper limit` of its movement; Fig. 5 is a perspective detail lview of the locking flange; and Fig. 6 is a perspective view of the upper end o-f the standard and nut.

In these drawings the invention is illustrated as applied to a self lowering jack of a known construction but it will be understood that the invention may be applied to jacks of various kinds and that the invention-itself may take various forms without departing from the spirit thereof. A

As here "shown, the ackcomprises a base l from'which there extends an upright hollowst'andard''having mounted in its upper 1921. y serial'No. 484,200.

end a nut 3- in which the liftin element 4 is screw threaded. The lifting'e ement supports at its upper end a cap, or work engagmg. member, 5 to which is secured a housing 6 extending downwardly therefrom and embracing the standard 2. The cap 5 and housing 6 .are rotatably supported on the lifting element and, as here shown, a ball bearing 7l` is interposedbetween the cap and the flat upper rsurface of a beveled gear 8 which is rigidly secured to the lifting element. The

beveled gear 8 meshes with a second beveled kgear 9y secured to a shaft 10 journaled in the sideV .of the housing 6 and having connected with its outer end suitableactuating devices, such as aratchet wheel 11 and'alever 12 carrying a pawl 13 to cooperate with the ratchet wheel 11. The jack is also provided 'f with suitable devices for controlling the downward' movement of the load but as these do not enter into the present invention they vneed not be herein described.

In order to positively limitthe movement of the lifting element relatively to the standard the latter is `provided near its upper end with a' laterallyV extending projection, or flange, arranged in the path of an inwardly projecting shoulder 14 carried by the stand'- ard near thelower end thereof. The stop at the upper end of the standard may take'various forms but preferably consists of 'a flange secured tothe standard and extending vsa laterally beyond the edge thereof. In that form of the device shown in Figs. 1 to 3 the flange is shown at 15 as rigidlysecured torand preferably formed integralwith the nut 3, the flange resting upon the upper edge of thetstandard and the nut being" secured to the'standard in any suitable manner as by means of a screw 16 extendingthrough an opening 17 in the side of the standard and into the nut, thus holding the nut against vertical displacement, the rotary strain on the nut being takenup by other means to be hereinafter described. To prevent strain being imposed upon the screw 16, the opening 17y 'is slightly larger than the head of the screw.

It is highly essential that a very strong, rigid connection should be provided between the nut and the standard to preventthe nut from rotating in the standard during the operation of the jack. This hasbeen'accomplished heretofore by providing theA tation.- ,InFigsl l to-3 the lugs are shown at' 19 a's'fo-rmed integral with the flange 15y and thenutf;l

, Ifdesired,vr the flange may be formed separately 'from both the -nut and the standard and aslshown in Figse, 5 andrG, the Hange tion-what we claim as new and comprises a separate member, or collar, 2O which rests-'upon the upper edges of the standard and nut, and in this form/0f the devicethe'nut is provided with one or more notches, or recesses,`21adapted to register with the corresponding recesses 18 in they standard.k yThe collar 20 carries vlugsl 22 adaptedto extend into the registering notches-'18 and `21 of the standard and nut, thusrsecuring the -nut against rotation in the-fstand'ard. i Y Thecollar, or flange, 2O may be connected with? the nut-and the standard in any suitable manner.` In-the present instance it is secured tothe upper edge of the standard byjscrews'V 23 whichfextend ythrough the ,flange=.and-are threaded into `the edge. of' the st: i .nda"r ilf.v` The innerledgey of the collar over-v laps-theV nut and thus establishes thernecessaltyl connection between these parts. In this manner the flange is retained in positionsolely bythe screws and in the event excessivek pressure; is applied'to the flange the screws will yield. Ordinarily the threads l will 'be stripped therefrom, thus disconnecting the parts'and preventing brealc age of themechanism. While the screws establish al connection between the flange andthe-standard which has ample strength under all vnormal conditions of operation they at the Sametime providey a point of leastfstrength which under abnormal conditions Will-yield, thus protecting theother parts of the mechanism from injury.

'VVhilewe have shown and described one embodiment of our invention we wish yit to vbe understood that we' do not desire Ato-be limitedto the detailsthereofas various modificationsmay occur to a person skilled in the art.

Having. now fully described our invendesireto secure by Letters vPatent is:

12.- In amechanismofjthe character described, a standard, a nut mounted in' said standard; f a lifting element screw f threaded into saidfnut, ahousingacarried @by saidliftving element embracing said? standard I4and 05 having a shoulder near the lower end thereof, and a flange secured to said nut and said y. standard and projecting beyond the'edg'e of said standard into the path of said shoulder.

2. In a mechanism of the character described, astand'ard', a nut mounted in said standard, a liftingelement screw threaded into said nut, a housing carried by said lifting element, embracing` said standard and .I havingfal shoulder near the lower` end therer of, a flange permanently secured tosaid-"nutv l and extending laterally beyond the edgeof said standard into the path of saidfshoulder,l and means carried by said flange for holding-said nut against/rotation in said standard.

V3. In* amechanism of the character de-H scribed, a standard, a nut mounted in said standard, a lifting element screw threaded into said nut, a housing carried by said lift-k ing element, embracingsaid standard and having a shoulder near the ylower end `thereof, a flan-ge formed integral with` said -nut` and extending beyond the outer edge of said standard into the path of saidshoulder, and*l interlocking parts carried'by saidnut andl-` said standard to holdrthe-nut against rota-A a, tion in said standard. Y,

4. In a mechanism of the character-Ide?` scribed, a standard'having a notch-in its 9,5 upper edge, a nut mounted in said standard,

a lug connected with said nut and adapted-r to enter said notch, means for attachingsaid nut to said standard, a lifting element screw threaded-into said nut, and means for oper 100 ating said liftingvelement. y

5. In` a mechanism'of the character de-y scribed, a standard having a notch inwits ilppredge, a nut mounted in said standard,

a flange connected with said nut, overlappingthegedge of-said standard andy having a lugY adapted Ito -entersaid notch,l a lifting.; element screw threaded into said nut,jan'd means for actuating said liftingelement.- l,

6. In a mechanism of the-characterdescribed, a standard having anotch in 4fits.l upper edge, a nut mounted in-saidstandardl and having a lug adapted to enter said notch, a, screw extending through` the'side wall of said standard into said-nut, alifting element Vscrew threaded into saidnut, and means forV actuating Asaid'liftingl ele`Y ment. Y. Y v Y n 7. In a mechanism of the character` described, a standard'having a notch in.its-120 upper edge, anut mounted in-said standard,

a flangeconnected with-said n ut, overlap.- ping theedgeof said standard and having,A

a lug adapted to enter said notch,.a screwj extending through thevside wall of vsaidy standard into said nut, the opening in the standard. through which said screw passes being larger' than the head--off-the screw, `a-

lifting element screw threaded yinto said nut, and means for actuating said lifting ele ment.

8. In a mechanism of the character described, a standard having a notch in its upper edge, a nut mounted in said standard, a fiange connected with said nut, extending beyond the edge of said standard and having a lug to enter the notch in said 10 Standard, a lifting element screw threadedr into said nut, and a part connected with said lifting element and arranged to engage the edge of said Harige to limit the relative movements of the lifting element and the standard.

In testimony whereof, We affix our signatures hereto.

CHARLES WILLIAM RIPSCH. JAMES G. DAWLEY. 

